I think they both do different things, no one should limit themselves as they are both delicious! Black is better for waking up or pairing with a strong flavored food where green is best on its own or with something not as strong in flavor.

Actually, black tea helps me sleep. But I found that people in Yuchi (Sun Moon Lake, a famous black tea plantation area in Taiwan) looks younger than people who live in other tea region (green tea/ oolong)

Yeah~I've read some related reportings as well. Basically, it's about better to take in antioxidants from fruits, vegetables .. natural food.. ect rather than from dietary supplement since there continue to be new discoveries on beneficial compounds in produce that have not previously been known, and therefore are not included in antioxidant dietary supplements. However, what's the relevance with the topic we are discussing? Please clarify...

Back to the tea issue... When businessmen want to sell you something, they will tell you how good it is for your health, like wine. But as for me, tea is not a medicine. All the beneficial for healthy is side effect.

That's what I feel too. I generally like green tea a lot better, but there are times when I didn't want to drink green tea but would like black tea or warm oolong. Health benefits always depend on what one needs. If I were starving, I'm sure cheese and bacon would be much much healthier than any tea

I haven't found any direct studies comparing the health effects of green tea to black tea, or other types of tea. I have read some studies that compare the antioxidant activity of various types of tea, but these studies are of questionable methodology, and their conclusions are mixed anyway. Although green tea is often found to have higher antioxidant activity by certain measures, than black, this doesn't mean it's healthier--studies of the mechanisms by which tea influences health have questioned the idea that the antioxidant activity is responsible for the health benefits.

I think right now, we can just say "we don't know", but also that it's been established in general that tea, regardless of type, is healthy.

One thing I will say, the chemical composition of tea varies hugely between different grades and quality levels of tea--caffeine content, antioxidant content, all sort of other things. So...the quality of tea may be important. This doesn't necessarily mean that higher-quality tea is healthier, although I have an intuition that this may be the case (keep in mind higher-grade teas are also often higher in caffeine though).

It's complex...and in the end tea is just a drink. The health benefits of tea are always going to be small, compared to, say, the health benefits of regular exercise.